How to create a MATLAB function based offf of a flow chart? using for example f1(x) when referencing a function

I am trying to convert this flow chart into a MATLAB function with the commands:

Set: xL=a, xU=b, xm= (a+b)/2

If f(xL)*f(xm) < 0 set xU= xm If f(xL)*f(xm) > 0 set xL= xm If f(xL)*f(xm) = 0 xm is the root. Stop the algorithm.

Guidelines: function result=bisect(a,b,tol) %INPUT : a, b:search interval % tol:error tolerance %OUTPUT: result : root found

Thanks for the help!!